English printing

Mutate Double strikeWhenever this creature mutates, it deals 4 damage to target creature or planeswalker an opponent controls and you gain 4 life.

King Caesar, Awoken Titan

3/5

Oracle

Snapdax, Apex of the Hunt

Legendary Creature — Dinosaur Cat Nightmare

Mutate {2}{BR}{W}{W} Double strikeWhenever this creature mutates, it deals 4 damage to target creature or planeswalker an opponent controls and you gain 4 life.

3/5

Rulings

If there is no legal target for Snapdax’s triggered ability when it triggers, it won’t be put onto the stack at all and you won’t gain 4 life. Similarly, if the target creature or planeswalker is an illegal target by the time the ability tries to resolve, the ability won’t resolve and you won’t gain 4 life. [0000-00-00]